measurements & dates

CCAM Type 1 will have a lesion measuring (1)_______ than (2)__ cm.

1. Greater

2. 2

CCAM Type II will have multiple lesions measuring approximately __ cm.

1.5

CCAM Type III will have multiple lesions measuring __-__ mm.

0.5 - 5

The most sensitive period for cardiac development in the 1st trimester is between __-__ weeks.

3.5 - 6.5

Circulation has begun at the end of week __.

3

Division of the 4 chambers occurs during weeks __-__ of fetal development.

4 - 5

The heart will begin to beat at week __.

5

The heart takes up what fraction of the chest?

1/3

What is the normal ratio for lung maturity using the Lecithin-Sphingomyelin ratio?

Greater than 2:1

The axis of the heart will be at a __ degree angle.

45

What fraction of babies born with ASD have secundum defects?

8/10

An azygous vein will be approximately what fraction the size of the SVC?

1/3

Orbital distance will increase from (1)__ mm at 12 weeks to (2)__ mm at term.

1. 13

2. 59

Orbital distance will increase from 13 mm at (1)__ weeks to 59 mm at (2)____.

1. 12

2. Term

What weeks can cleft lip/palate occur during?

6 - 10

Choroid plexus cysts will often disappear by __ weeks.

26

Acrania can be detected as early as __-__ weeks.

10 - 14

Anencephaly can be detected as early as __-__ weeks.

10 - 14

Diagnosis of agenesis and hypoplasia of the cerebellar vermis should not be made prior to week __

18

With cystic hygroma, any posterior neck thickness measuring (1)_______ than (2)__ mm, with or without septations, should be followed.

1. Greater

2. 3

What does a normal cisterna magna measure?

3 - 10 mm

An enlarged lateral ventricle will measure greater than __ mm.

10

An enlarged third ventricle affected by ventriculomegaly will be dilated greater than __ mm.

5

The first trimester include weeks__-__.

0 - 12

The second trimester include weeks__-__.

13 - 28

The third trimester include weeks__-__.

29 - 40

Anasarca is edema of fetal tissue. The skin will thicken to be (1)_______ than (2)___ mm.

1. Greater

2. 5

Pregnancy-induced HTN is diagnosed after ___ weeks of gestation.

20

Spalding’s sign can be seen ___ week after fetal demise.

1

Robert’s sign can be seen ___ week after fetal demise.

1

Type 2 diabetes makes up __-__% of all maternal diabetes cases.

90% - 95%

Type 1 diabetes makes up __-__% of all maternal diabetes cases.

5% - 10%

Vertebral defects of CRS present in __-__% of cases.

60% - 80%

Anal atresia of CRS present in __-__% of cases.

60% - 90%

Cardiac defects of CRS present in __-__% of cases.

40% - 80%

Trachea-esophageal fistula/atresia of CRS present in __-__% of cases.

50% - 80%

Renal anomalies of CRS present in __-__% of cases.

50% - 80%

Limb abnormalities of CRS present in __% of cases.

50%

About __-__% of women diagnosed with pre-eclampsia will develop HELLP syndrome.

4% - 12%

Nonimmune hydrops account for __% of hydrops.

90%

Fetal cardiac issues make up for __% of the cause of nonimmune hydrops.

40%

With doppler of the uterine artery, it is normal to see a diastolic notch until about ___ weeks.

26

When is it abnormal to see a diastolic notch or a high resistance waveform for the uterine arteries?

After 26 weeks

Pulsatility of the umbilical vein is normal to see up until ___ weeks.

20

An abnormal S/D ratio of the umbilical artery will be (1)________ than (2)___ after (3)___ weeks. It will also be demonstrated with a high resistance waveform.

1. Greater

2. 3

3. 30

1. Some evaluate the ductus venosus between weeks __-__ and __ days.

2. Others will in the __ and __ trimesters.

1. 11-13, 6

2. 2nd and 3rd

At __ weeks gestation, a triphasic waveform with positive atrial contraction will be seen for a doppler of the ductus venosus.

25

What is the ideal time for when to label which fetus twin A, twin B, or so on?

10 - 14 weeks

An appearing twin is when the gestational sac of the twin was not visualized at week __ or __ but seen later in pregnancy.

5 or 6

At what day will the formation of the chorion occur?

4

At what days will the formation of the yolk sac occur?

6 - 8

At what days will the formation of the amnion occur?

8 - 9

The zygote will divide between days __-__.

6 - 7

Monozygotic twins “Di-Di” occurs when one zygote divides during days __-__.

0 - 4

With monozygotic twins “Mo-Di,” the zygote will divide during days __-__.

4 - 8

With monozygotic twins “Mo-Mo,” the zygote will divide during days __-__.

8 - 12

Conjoined twins can occur if division occurs after __ days.

13

A uterine artery S/D ratio measuring (1)________ than (2)___ can be an indication for decreased maternal blood supply.

1. Greater

2. 2.6

Fill in the blanks:

1. The chorion will form at ___ days

2. The zygote will divide between __-__ days.

3. The yolk sac will form at __-__ days.

4. The amnion will form at __-__ days.

1. 4

2. 6 - 7

3. 6 - 8

4. 8 - 9

With monozygotic twins…

1. “Di-Di” zygote will divide during days __-__.

2. “Mo-Di” zygote will divide during days __-__.

3. “Mo-Mo” zygote will divide during days __-__.

1. 0 - 4

2. 4 - 8

3. 8 - 12

Skeletal dysplasia is suspected when limb length falls (1)________ than (2)___ standard deviations below the mean.

1. Greater

2. 2

Short rib polydactyly syndrome will be __% lethal.

70%

Adults with Diastrophic Dysplasia are usually (1)_______ than (2)___ feet in height.

1. Less

2. 4

After what week can the double bubble sign appear for duodenal atresia?

24

The fetal kidneys will begin to excrete urine after what week?

11

The fetal kidneys will not become the major contributor of fetal urine (amount of amniotic fluid volume) until __-__ weeks.

14 - 16

Bilateral renal agenesis will typically be seen between __-__ weeks.

16 - 28

What AP measurement is considered moderate hydronephrosis if the fetus is between 16-27 weeks?

7 - 10 mm

What AP measurement is considered severe hydronephrosis if the fetus is between 16-27 weeks?

Greater than 10 mm

What AP measurement is considered moderate hydronephrosis if the fetus is greater than 28 weeks?

9 - 15 mm

What AP measurement is considered severe hydronephrosis if the fetus is greater than 28 weeks?

Greater than 15 mm

What are the upper limits for the nuchal fold?

Greater than 6 mm

How large would the renal pelvis have to be for it to be an indication of Trisomy 21?

Greater than 10 mm

What renal pelvis measurement is abnormal from 18-20 weeks?

Greater than 4 - 4.5 mm

What renal pelvis measurement is abnormal from 20-29 weeks?

Greater than 5 mm

What renal pelvis measurement is abnormal at 32 weeks?

Greater than 6 mm

What renal pelvis measurement is abnormal during the 3rd trimester?

Greater than 7 mm

Clinodactyly most commonly affects which finger?

5th

What weeks is a chorionic villus sampling performed?

10 - 14

Maternal blood tests are typically performed between what weeks?

16 - 18

The double bubble sign is seen after ___ weeks.

24

The nuchal translucency measurement is taken between what weeks?

11 - 14

Only __% of infants with Trisomy 18 live past a week.

50%